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Precision Circuits Battery Isolator Manager


Precision Circuits 00-10041-260, Battery Isolator Manager, 225 Amp, intelligent lithium-ion enabled battery isolator

SKU: PRE-181-100 Categories: , Tags: , ,

The Precision Circuits Lithium Battery Isolation Manager (Li-BIM), product code 00-10041-260, is an intelligent battery isolator that manages the house battery and the engine/starter battery in an RV, motor-home, or fifth-wheel. This prevents loads in one system from discharging both. It also connects the two battery systems together during charging. Both batteries are charged if either is being charged: The house battery is charged while driving and the engine battery is charged while plugged into shore power at a campground.

The Li-BIM is microprocessor based, and much more intelligent than your average battery isolator. It monitors battery Voltages over long periods of time, and is not just Voltage dependent. The Voltage settings of the Li-BIM are such that it works well with a lead-acid engine battery and lithium-ion house battery (though a lead-acid house battery will work too).

The Li-BIM monitors the battery voltage of both the lead acid engine and lithium-ion house batteries over long periods of time. If it senses a charging voltage, it connects the two batteries together. It will both charge the house battery from the alternator, as well as the engine battery from shore power, depending in where it sees a charging Voltage. It will disconnect the house battery if the alternator exceeds 14.4 Volt, to prevent overcharging of lithium-ion batteries. If the charging system is drastically overburdened, the batteries will be isolated, however, if the Li-BIM sees a long term charging of both batteries it will allow the batteries to remain connected and allow the charging system to do its job. Once the batteries have charged for one hour, the Li-BIM will isolate the batteries to prevent overcharging, and will only reconnect the batteries for charging if one of the batteries drops to approximately 80% charge, and the other is being charged. This long term monitoring of the batteries prevents the annoying relay clicking that exists in simpler isolation modules today. The Li-BIM does not guarantee 100% battery charge, but prevents harmful battery charge levels.

It draws no current in the on or off states. It supports currents of 225 Amp continuous, and 1,200 Amp for 30 seconds. Please note the spec sheet (in the “documents” section) is wrong; it states 160A for this version of the Li-BIM, while the unit really is made for 225A continuous.

Works great in combination with the Precision Circuits Battery Guardian, especially for lithium-ion batteries!


Precision Circuits 00-10041-260 wiring diagram


  • Approved for installation in battery compartments, ignition proof, meets SAE J1171
  • Waterproof, IEC 60529, IP66 IP67, ASTM B 117 96-hours salt spray
  • Isolates batteries to prevent discharging or overcharging
  • Provides emergency start with dash switch
  • Weighs under 1 pound



Mnfr. model


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